MINIMUM REQUIREMENTS FOR MOTOR VEhICLE BRAkE LININGS -SAE J998

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1 Appendix A Appendix MINIMUM REQUIREMENTS FOR MOTOR VEhICLE BRAkE LININGS -SAE J998 SAE Recommended Practice 1. Scope - This specification covers brake linings used on motor vehicles operated on the public ways, except those used only for parking brakes. The performance requirements outlined in this SAE Recommended Practice are base on cur rently available engineering data. It is intended that all portions of this recommended practice will be reviewed periodically and revised additional knowledge regarding brake lining performance is developed. 2. Purpose - The purpose of this SAE Recom mended Practice is to establish minimum co efficient of friction requirements for brake linings used in the service brake system of a motor vehicle. Linings that meet these minimum friction requirements may not be suitable for use on all vehicles because of differences in brake design or application. 3. Test Procedure - Five complete tests shall be conducted on each brake lining in accordance with the SAE J Brake Lining Evaluation - Brake linings shall be evaluated for normal and hot friction coefficients in accordance with SAE J Minimum Requirements - To meet minimum requirements a brake lining shall have: 5.1 A normal friction coefficient over.25 based on the average of five tests. 5.2 A hot friction coefficient over.15 based on the average of five tests. 5.3 A coefficient of friction of.15 or over on each of the five tests at the following points: Between 200F and 550F, inclusive, on the second fade run Between 300F and 200F, inclusive, on the second recovery run. 5.4 Not more than a 20% or.050 variation of coefficient of friction, whichever is greater, below the average value of all five tests at each temperature point specified in para graph 5.3 (Report of SAE Brake Committee approved January 1968.) Appendix B MOTORCYCLE ANd MOTOR VEhICLE CYCLE ELECTRICAL SYSTEM (Maintenance of design Voltage) SAE J392 SAE Recommended Practice 1. Purpose - This SAE Recom mended Practice provides minimum illumination voltage values for motorcycle and motor driven cycle electrical systems and accompanying test procedures. (NOTE: Where the word motorcycle appears in the report, it is understood to include motor driven cycle. ) 2. Scope - This recommended practice pertains to both battery-equipped and batteryless motor cycle electrical systems. 3. Test Apparatus. 3.1 Voltmeter V maximum full-scale deflec tion, accuracy +1/2% (two voltmeters re quired). 3.2 Ammeter - Capable of carrying full system load current. Accuracy +3%FS. 3.3 Means for Measuring Engine RPM - Accu racy +3%. Appendix-1 Vehicle Equipment and Inspection Regulations PUB 45

2 Appendix 4. Test Procedure 4.1 Install fully charged original equipment battery on the motorcycle (if motorcycle is battery equipped) Battery temperature to be 80+ or -10F. 4.2 Connect one voltmeter between the headlamp low beam terminal and the ground; connect the other voltmeter between the tail lamp terminal and the ground. 4.3 Connect the ammeter in series with the battery. (NOTE: Disregard paragraph 4.3 for batteryless machines.) 4.4 Start engine and turn on headlamp(s) Switch headlamp to the low beam position External fan cooling may be applied to the motor cycle engine. 4.5 Run the engine at an RPM equivalent to 30 MPH in top gear for 10 minutes Record the lowest and highest head -lamp voltage and taillamp voltage observed during the 10 minute period. 4.6 Increase speed to manufacturer s sug gested maximum RPM Record the highest and lowest head -lamp and taillamp voltages ob served during a 5-second period. 4.7 Run the engine at manufacturer s rated idle speed for 10-minutes Record the lowest and highest taillamp voltage observed during the 10-minute period Record the lowest and highest headlamp voltage observed during the 10-minute period. 4.8 Slowly increase the engine speed until generating equipment cancels the system load, indicated by 0 reading on the am meter. (NOTE: Disregard paragraph 4.8 for batteryless motorcycles.) Record the engine RPM at ammeter zero point. 5. Test Limits 5.1 Voltages recorded in paragraphs 4.5.1, and shall be between 80% and 120% of the rated headlamp design voltage. 5.2 Voltages observed in paragraph shall be between 40% and 120% of the rated headlamp design voltage. 5.3 Engine RPM observed in paragraph shall be less than the motorcycle equi va lent speed at 30 MPH in top gear opera tion. (Report of Motorcycle Committee and Lighting Com mittee approved December Editorial change November 1971.) Vehicle Equipment and Inspection Regulations PUB 45 Appendix-2

3 CHART 1 Headlight Aiming Screen Distance and Marking Identification VISUAL headlamp AIM, AdJUSTMENT ANd INSPECTION REF-1 Vehicle Equipment and Inspection Regulations PUB 45

4 CHART 2 High Beam Inspection Limits This pattern represents the light pattern as it should appear on the view screen of approved photo-electric aimers. CHART 3 Low Beam Inspection Limits Vertical Centerline of Lamp Horizontal Centerline of Lamp Horizontal Limits + 4 inches Vertical Limits + 4 inches This pattern represents the light pattern as it should appear on the view screen of approved photo-electric aimers. Lamp Pattern (Hot spot cannot be located)...consider whole pattern Vehicle Equipment and Inspection Regulations PUB 45 REF-2

5 CHART 4 Brake Chamber Push Rod Travel (Typical) Short as Possible Without Brakes Dragging Applied Position Released Position REF-3 Vehicle Equipment and Inspection Regulations PUB 45

6 CHART 5 Scrub Line (STREET RODS, SPECIALLY CONSTRUCTED AND RECONSTRUCTED VEHICLES) A scrub line is an imaginary surface created if lines were drawn from bottom of wheel rim on one side to bottom of tire on other side. When lines are drawn from both sides an X under the vehicle suspension is created. No suspension or chassis component shall be below top portion of this imaginary X. Vehicle Equipment and Inspection Regulations PUB 45 REF-4

7 CHART 5 (Continued) diagram OF ThE REAR SUSPENSION, ANd how TO ChECk SCRUB LINE (SCRUB LINE ThAT EXISTS FROM FRONT TO REAR SUSPENSION) REF-5 Vehicle Equipment and Inspection Regulations PUB 45

8 Brakes Brake failure ranks as the leading mechanical cause of highway crashes. Brakes require special care to ensure that the braking system is operating properly. The major brake inspection defect items are: Hydraulic hoses or tubing Wheel cylinders and calipers Brake drums or rotors Brake linings The following illustrations will provide the inspector with additional guidance for inspection of these components. Figure 1 shows typical brake system configurations including hydraulic brake system tubes and lines and anti-lock brake (ABS) system electronic controls and sensors. The hoses and tube should be visually checked for leaks, cracks, chafing, flattened or restricted sections, or improper retention. TYPICAL BRAkE CONFIGURATIONS Vehicle Equipment and Inspection Regulations PUB 45 REF-6

leakage, damaged, loose or missing parts, retention and dust boot

The caliper assembly should be checked for leakage, missing parts and

9 Figure 2 Shows a typical drum brake. When the drum is removed, the wheel cylinder should be checked for leakage, damaged, loose or missing parts, retention and dust boot condition. Figure 3 Shows a typical caliper drum brake. The caliper assembly should be checked for leakage, missing parts and retention. Figure 4 Illustrates a typical disc brake assembly for a front wheel drive vehicle. REF-7 Vehicle Equipment and Inspection Regulations PUB 45

10 Figure 5 Illustrates marking and measurements of brake rotors and brake drums. The maximum allowable drum diameters and minimum rotor thickness are cast into the parts. Drums or rotors must not be scored deeper than inches. Vehicle Equipment and Inspection Regulations PUB 45 REF-8

11 Figure 6 Illustrates disc brake pads and FIgure 7 illustrates typical drum brakes. Visually inspect the lining to see if it is broken, not firmly attached, or contaminated with oil, grease or any other substances that would affect operation. Use the proper measuring device to measure the linings and pads. Bonded linings must be no less than 2/32 inch and riveted linings must be no less than 1/32 inch above the rivet head at the thinnest point. REF-9 Vehicle Equipment and Inspection Regulations PUB 45

12 Tires Vehicle Equipment and Inspection Regulations PUB 45 REF-10

13 Steering System REF-11 Vehicle Equipment and Inspection Regulations PUB 45

14 Suspension System Vehicle Equipment and Inspection Regulations PUB 45 REF-12

Air Brake Inspection Presented By: G.L. May

Air Brake Inspection Presented By: G.L. May Air Brake Inspection 2012 Presented By: G.L. May Outline of this course Objective of this course: The technician will have a better understanding of requirements for air drum brakes and air disc brakes